Motor-support and bobbin-winder of sewing machines



G. M. EAMES I 2,018,624

MOTOR SUPPORT AND BOBBIN WINDER OF SEWING MACHINES Oct. 22, 1935,

2 Sheets-Sheet 1 Filed April 7, 1932 IIIIIIIIIIIIIII I lllllll Oct, 22,1935. 2,018,624

-MOTOR SUPPORT AND BOBBIN WI'NDER 0F SEWING MACHINES M. EAMES 2Sheets-Sheet 2 Filed April 7, 1932 Jmmtw Geo ye M flames Patented Oct.22, 1935 UNITED STATES MOTOR-SUPPORT AND BOBBlN-WINDER OF SEWINGMACHINES George M. Eames, Bridgeport, Conn., assignor to The SingerManufacturing Company, Elizabeth,- N. J a corporation of New Jersey 8Claims.

This invention relates to sewing machines and more particularly toelectric drives, andbobbinwinders therefor.

During the operation of lock-stitch sewing machines it is frequentlynecessary to rewind the bobbin which supplies the lower thread to thestitch-forming mechanism. In certain types of sewing machines asheretofore constructed the driving means has been connected to thebalance- 10 wheel of the sewing machine which is connected to thestitch-forming mechanism by suitable means including a clutch so thatthe balancewheel could be disengaged from the stitch-forming mechanismwhen it is desired to wind the bobbin. This arrangement fordisconnecting the driving means from the stitch-forming mechanism wasprovided to prevent the stitch-forming mechanism from disturbing apartially completed seam; to make it unnecessary to unthread themachine; and to prevent unnecessary .wear and undue vibration during thebobbinwinding operation. These machines were provided with abobbin-winding supporting spindle mounted independently 'of the sewingmachine mechanism and adapted to be connected to the driving mechanismafter the latter has been disconnected from the stitch-formingmechanism.

In the small portable types of sewing machines having their main ordriving shaft located below the bed-plate no provision is made fordisconnecting the stitch-forming mechanism from its actuating means; Thebobbin, in such instances, is usually wound upon .a bobbin-supportingextension on the upper or needle-bar 36 actuating shaft. Thedisadvantages of this construction are: unnecessary wear and unduevibration; and the necessity of 'unthreading the machine during thebobbin-winding operation.

The objects of this invention are: to greatly 40 simplify the mechanismrequired to disconnect the actuating means from the stitch-formingmechanism; to provide simple and eifective means for winding the bobbin;to construct a bobbin-winder which is light in construction and can bemanufactured and assembled at little expense; to provide improved meanswhereby the friction between the driving and driven means remainsconstant; and to provide means whereby the element transmitting powerfrom the driving to the driven means can be replaced readily. With theabove and other objects in view, as

will hereinafter appear, the invention consists in the devices,combinations, and arrangements of parts hereinafter set forth andillustrated in the accompanying drawings of a preferred em- ApplicationApril 7, 1932, Serial No. 603,775

bodiment of the invention, from which the several features of theinvention and the advantages attained thereby will be readily understoodby those skilled in the art.

In the drawings: I

Figure 1 is a top plan view of the base of a family type portable sewingmachine embodying m'y improved motor-support and bobbin-winder, partlybroken away to show the relation of the parts.

Figure 2 is a rear elevation, partly in section, of the machine.

Figure 3 is an end elevation. Figure 4 is a perspective view of thelever for shifting the driving means into and out of drivll ing relationwith the main shaft.

In the embodiment'of this invention selected. for illustration, I is thebase plate to which is secured by the screws 3 the hollow bed 2 of thesewing machine. The machineis provided with 20 the usual balance-wheel 4having a belt-groove 5. The balance-wheel 4 is fixed upon the main shaft6 located in the bed-plate 2 of the sewing machine, which shaft actuatesthe stitch-forming mechanism in the usual and well known 2| manner.

Pivotally secured upon the base I by the pivot screw I is a fiat arm 8having an upturned portion 9. Secured by screws ID to the free end ofthe fiat arm 8 is a dynamo-electric device or so t the base i by screws20. A compression spring 2i reacting against the closed end I8 of thehollowv case ll urges the plunger 22 into contact with the upstandingportion 9 of the flat arm 8. The 65 compression spring 2! is strongenough to swing the motor ii in a counterclockwise direction orrearwardlyaway from the balance-wheel 4. From the foregoing it will beobvious that the motor is mounted in such a manner that it tends 60constantly to swing or move about its pivot I in a direction to tightenthe' belt I6, thus at all times maintaining the belt 'lfiunder tension.

Pivotally secured upon the end wall ofthe hollow bed 2 by the shoulderedscrew 23 is a lell ver 24 having a stop 25, a projection 26, and anoutwardly extending lip 21 made integral therewith. A smooth wear plate28 is tacked to the base I, the object of which is to provide a smoothsurface over which the motor Il may slide when it is shifted towards andaway from the balancewheel 4.

To disconnect the motor II from the balancewheel 4, the lever 24 isshifted from the dotted line position to the full line position as shownin Figure 3. Shifting of the lever 24 causes the projection 26 of thelever to contact the motor bearing-bushing 29 and force the motor IItowards the balance-wheel 4. When the lever 24 reaches the full lineposition as shown in Figure 3, the bearing-bushing 29 enters thedepression 26' where it is locked, due to the contour of the lever 24,until it is released by shifting the lever 24 to the dotted lineposition shown in Figure 3. During the shifting of the lever 24 from thedotted to the full line position the outwardly extending lip 21 engagesthe lower or slack run of the driving belt 5 and forces it upwardthereby relieving the belt l6 of any tendency to frictionally adhere orengage the driving pulley I 4 and establish driving relation with thebalancewheel 4. After the motor has been shifted out of driving relationwith the balance-wheel, the bobbin may be wound by placing it on thebob-' bin-winding spindle l5 and operating the motor control in theusual and well known manner.

It will be observed that the pivot point I is located at the extreme endof the fiat arm 8 thus increasing the radius of the arc through whichthe driving pulley I4 moves. Due to the fact that the are through whichthe driving pulley l4 moves is small and due to the location of thepivot point 1 the belt-groove IS in the driving pulley l4 and thebelt-groove 5 in the balancewheel 4 are always substantially inalignment. The advantages of mounting the motor in this manner are: thedriving belt does not have to be made with the same exactness as whenthe motor is rigidly mounted; the slack in the belt is taken upautomatically as the belt stretches; the tension on the belt is constantwhen the motor is driving the machine, thus reducing wear on the belt;and the belt can be readily replaced when it becomes worn.

From the foregoing description considered in connection with theacompanying drawings, the construction, manner of operation and severaladvantages of my improved motor-support and bobbin-winder will beclearly and fully understood It is apparent that such a device has awide variety of uses, and it willbe understood that the form,construction and arrangement of the several elements employed may bevaried. Therefore, the privilege is reserved of resorting to all suchlegitimate changes therein as may be fairly embodied within the spiritand scope of I thra'mcemcdcclaims.

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t he l2! imai-stahtio 5: t 21d let .nratdho iii If'J t1 iiel up m mosall. 1 i: 1! vii imiidin g. in :lbi'nnit Willi 2. In combination with asewing machine having a main shaft, a motor having a rotor shaft with a.bobbin-supporting spindle thereon, means connecting said rotor shaftwith said main shaft, spring means urging said motor into driving re- 5lation with said connecting means, and a member for shifting and lockingsaid motor out of driving relation with said connecting means, wherebysaid motor may be used independently of the machine for winding 9.bobbin.

3. In combination with a sewing machine having a main shaft with abalance-wheel fixed thereon, a motor fixed to one end of an armfulcrumed on a vertical pivot fixed to the bed of the sewing machineframe, said motor having a 15 rotor shaft with a driving pulley and abobbinwinding spindle fixed thereon, and a single means for shifting andlocking said motor into and out of driving relation with saidbalance-wheel.

4. In combination with a. sewing machine hav- 20 ing a. main shaft witha balance-wheel fixed thereon, a motor pivoted to the base of the sewingmachine, said motor having a rotor shaft with a driving pulley and abobbin-winding spindle fixed thereon, a belt connecting said balance- 25wheel and driving pulley in driving relation, spring means constantlyurging said motor away from said balancewheel to maintain said belttaut, and means for shifting said motor towards said balance-wheelagainst the action of said spring means.

5. In combination with a sewing machine having a frame and a main-shaftwith a balancewheel fixed thereon, a motor movably mounted on the frameof the sewing machine, said motor hav ing a rotor shaft with a drivingpulley and a bobbin-winding spindle thereon, a belt connecting saidbalance-wheel and driving pulley in driving relation, spring means forconstantly urging said motor away from said balance-wheel to maintain 40said belt taut, and'a lever for shifting said motor towards saidbalance-wheel against the action of said spring.

6. In combination with a sewing machine having a hollow bed, amain-shaft Journaled in said 45 bed, a balance-wheel carried by saidshaft, a motor located in said bed and movably sustained thereby, saidmotor being provided with a driving pulley and a bobbin-winding spindle,a belt connecting said driving pulley with said balance- 50 wheel, aspring constantly urging said motor away from said balance-wheel tomaintain said belt taut, means for shifting said motor towards saidbalance-wheel against the action of said spring to render said motorineffective to drive said balance-whe'el and main-shaft, and means forlooking said motor in its ineffective position.

7. In combination with a sewing machine having a main-shaft with abalance-wheel fixed thereon, a motor movably secured to the frame of 60the sewing machine, said motor having a rotor shaft with a drivingpulley fixed thereon, a belt ornrume'ntin g: iidi b.atla'ncec-o-lriviedefa ail-dunno p with:

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the sewing machine, a driving pulley carried by said motor, a beltconnecting said balance-wheel and driving pulley in driving relation,spring means constantly urging said motor away from said balance-wheelto maintain said belt taut, and a lever pivoted to the frame of themachine for shifting said motor towards said balancewheel against theaction of said spring, said lever being formed with a lip which isadapted to engage and raise the slack run of said belt to furtherrelieve the belt of a tendency to frictionally engage the drivingpulley.

GEORGE M. EAMES.

